Heel attaching machines



A g- 1961 w. F. M KENZIE ET AL 2,994,882

HEEL ATTACHING MACHINES Filed Jan. 7, 1959 16 Sheets-Sheet 2 Aug. 8,1961 w. F. M KENZIE ET AL 2,994,882

HEEL ATTACHING MACHINES Filed Jan. 7, 1959 16 Sheets-Sheet 5 Aug. 8,1961 w. F. MacKENZIE ET AL 2,994,882

HEEL ATTACHING MACHINES Filed Jan. 7, 1959 16 Sheets-Sheet 4 Aug. 8,1961 w. F. M KENZlE ET AL 2,994,882

HEEL ATTACHING MACHINES Filed Jan. '7, 1959 16 Sheets-Sheet 5 Aug. 8,1961 w. F. MaCKENZlE EIAL 2,994,882

HEEL ATTACHING MACHINES Filed Jan. 7, 1959 16 Sheets-Sheet 7 Aug. 8,1961 w. F. MacKENZlE ET AL 2,994,882

HEEL ATTACHING MACHINES Filed Jan. 7, 1959 7&6 Sheets-Sheet 8 1961 w. F.M KENZIE ET AL 2,994,882

HEEL A'fTACI-IING MACHINES- Filed Jan. 7, 1959 16 She Aug. 8, 1961 w. F.M KENZlE ET AL 2,994,882

HEEL ATTACHING MACHINES Filed Jan. 7, 1959 16 Sheets-Sheet l0 Aug. 8,1961 w. F. M KENZiE ET AL 2,994,882

HEEL. ATTACHING MACHINES Filed Jan. 7, 1959 16 Sheets-Sheet ll Aug. 8,1961 w. F. M CKENZIE ET AL 2,994,882

HEEL ATTACHING MACHINES Filed Jan. 7, 1959 16 Sheets-Sheet 12 I &llilllllllllllllllllllllllllllllll I Aug. 8, 1961 w. F. M QKENZlE ET AL2,994,882

HEEL ATTACHING MACHINES l6 Sheets-Sheet 13 Filed Jan. 7, 1959 Aug. 8,1961 w. F. M CKENZIE ET AL 2,994,882

HEEL ATTACHING MACHINES 16 Sheets-Sheet 14 Filed Jan. '7, 1959 Aug. 8,1961 w. F. M KENZIE EI'AL 2,994,882

HEEL ATTACHING MACHINES Filed Jan. 7, 1959 1s Sheets-Sheet 16 UnitedStates Patent 2,994,882 HEEL ATTACHING MACHINES William F. MacKenzie,Hamilton, and Ferman N. Lee, deceased, late of Danvers, Mass, by DoloresR. Lee, executrix, Binghamton, N.Y., assignors to United Shoe MachineryCorporation, Flemington, NJ., at corporation of New Jersey Filed Jan.7,-1959, Ser. No. 785,462. 20 Claims. (Cl. 1-139) This invention relatesto machines for attaching rubber heels and leather heels and theirtoplifts to shoes by outside nailing and is illustrated as embodied inan improved machine of the general type disclosed in United StatesLetters Patent No. 2,746,046, granted May 22, 1956, on an applicationfiled in the names of Ferman N. Lee, William F. MacKenzie, Alfred C.DArcey and Alfred C. Cicchetti.

The machine disclosed in said Patent No. 2,746,046 is provided With anailing die, which has driver passages extending through it, and naildrivers which slidingly lit in said passages and at all times areassembled with the nailing die for installation as a unit in a pair ofcavities formed in the frame of the machine. Nails are supplied to thenailing die from a tube holder by the use of a loader block which hasnail passages formed in it and is moved between a loading positionbeneath the tube holder and a dumping position above the nailing die.The passages of the associated nailing die and the loader block are ofthe same pattern, four nailing die and driver units and four loaderblocks corresponding respectively to said units being necessary toaccommodate a complete run of sizes. In most factories the shoes arriveat the machine on racks, said shoes usually being of split sizes, andaccordingly it is necessary frequently to change the nailing die anddriver unit and the loader block of the machine to accommodate the shoeswith the result that the production of the machine is materiallyreduced.

It is an object of the present invention to provide a machine which willquickly and effectively attach rubber heels and leather heels and theirtoplifts to shoes and which has none of the above-mentioned drawbacks.With the above object in view, and in accordance with a feature of thepresent invention, the illustrative machine is provided with a turrethaving mounted on it in circumferentially spaced relation a plurality ofnailing die and driver units which are of different patterns and areadapted to accommodate a complete run of sizes of shoes, said turretbeing rotatable into different initially operative positions so that theoperator may quickly and effectively move any one of the nailing die anddriver units into an active operating position at a heel attachingstation of the machine. By providing such a construction the timeconsuming changeover referred to above of the nailing die and driverunits, now used in present commercial machines as well as in the machinedisclosed in said Patent No. 2,746,046, is avoided. In order toeliminate in the present machine the use of the loader block and thenecessity of changing said block as above explained, to accommodate afull run of sizes of shoes, the turret, in accordance with anotherfeature of the invention, is automatically rotated in one direction tomove the active nailing die of the turret beneath the tube holder toreceive a load of nails and in an opposite direction to move the nailingdie back to the heel attaching station.

In the attachment of the leather heel to the shoe by the use of thepresent commercial machines heavy pressure is exerted against the lastupon which the shoe is mounted in order to hold it against the forceimparted to the shoe by the heel attaching nails which are all drivensimultaneously into the heel and the heel seat of the shoe and areclinched against the heel plate of the last, the pressure exerted on thelast during this operation often being sufficient to break the last. Itis another object of the present invention to reduce the pressureapplied to the last during the attachment of the leather heel to theshoe. With this object in view and in accordance with another feature ofthe present invention the illustrative machine is provided with primaryand secondary sets of drivers, fluid pressure operated means foractuating said sets of drivers in succession, and mechanism hereinafterdescribed for insuring that all the nails shall be driven to the samedepth into the work.

The present invention consists in the above novel features and in novelfeatures which are hereinafter described and are directed toimprovements in the automatic control of a heel and toplift carriage ofthe machine, means for selectively setting up the machine to operateeither on rubber or leather work, and means for improving the feeding ofnails to the tube holder of the machine, reference being had to theaccompanying drawings which illustrate one embodiment of the inventionselected for purposes of illustration, said invention being fullydisclosed in the following description and claims.

In the drawings,

FIG. 1 is a perspective view from the front and the left of theillustrative machine;

FIG. 2 is a right side elevation, partly broken away and partly insection, of the machine;

FIG. 3 is a perspective view showing the interior of a portion of themachine, a front cover of which has been removed;

FIG. 4 shows in front elevation, partly broken away and partly insection, a turret with sets of nailing die and driver units mounted onit, a vertical shaft which is journaled for movement about an axis, andmeans for securing the turret in different operating positions to theshaft and for disconnecting it from said shaft;

FIG. 5 is a plan view, partly in section, on the line VV of FIG. 2showing a carriage for a heel and a toplift arranged above the turret,and mechanism for use in positioning the heel and the toplift over anactive nailing die which is mounted in the turret and is arranged at aheel attaching station of the machine;

FIG. 6 is a view showing portions of the carriage actuating mechanism ofthe machine as viewed from the rear;

FIG. 7 is a view similar to a portion of FIG. 5 showing a carriageadapted to support a rubber heel which is to be attached to a shoe, saidcarriage at all times remaining in a fixed operating position;

FIG. 8 is a view, partly in section on the line VIII- VIII of FIG. 5,showing details of the vertical shaft and the turret;

FIGS. 9 and 10 are sections on the lines IX-IX and X-X of FIG. 8respectively;

FIG. 11 is a view, partly in side elevation and partly in section ofnail driving mechanism and fluid pressure actuated means for operatingsaid mechanism;

FIG. 12 shows the mechanism illustrated in FIG. 11 partly in sideelevation and partly in section on the line XII--XII of FIG. 11;

FIG. 13 is a front view of a nail distributor of the illustrativemachine;

FIG. 14 is a section on the line XIVXIV of FIG. 13 showing a nailconduit and a nail roll from which nails are dumped into said conduit;

FIG. 15 shows in front elevation, on an enlarged scale and partly brokenaway, portions of the distributor shown in FIG. 13;

FIG. 16 is a plan view of the portion of the distributor shown in FIG.15;

FIG. 17 is a plan view of a portion of the right side 1 of the naildistributor showing clutch mechanism ineluding 'a lever for controllingvibration of the the distributor and also showing a switch which isoperative in response to movement of said lever;

FIG. 18 is a side view of a gage which is used for centralizing the heelseat of the shoe with its heightwise median longitudinal plane inalinement with a vertical median plane of an active nailing die at theheel attaching station of the machine;

FIG. 19 is a plan view on the line XIXXIX of FIG. 18;

FIG. 20 is a front view of the gage shown in FIG. 18;

'FIG. 21 is a schematic diagram showing fiuid pressure means foroperating the illustrative machine;

FIG. 22 is a detail View of a switch which is operative in response tomovement of a jack actuating control rod and is also shown in FIG. 2;

FIG. 23 is a view showing in detail a treadle of the machine;

FIG. 24 is a wiring diagram for use in describing the operation of themachine;

FIG. 25 is a perspective view of a battery of four tube holders whichare mounted on a platform and any one of which may be selectively movedto an active position beneath a foot plate of nail distributingmechanism of the machine;

FIG. 26 is an exploded view, partly broken away and partly in section,showing in perspective the rear end of a shoe to which a leather heelhas been attached by the use of the illustrative machine and alsoshowing a top- ]ift which is to be spanked onto the heel; and

FIG. 27 is a perspective view, partly broken away and partly in section,of a rear portion of a shoe to which a rubber heel and its base lifthave been attached by the use of the machine.

The illustrative machine is described with reference to the attachmentof a leather heel 30 and its toplift 32 to the heel seat of a shoe 34,which is mounted on a last 36, by the use of cut nails 38 (FIG. 26) andalso with reference to the attachment of a rubber heel 40 (-FIG. 27) anda base lift 42, which is spotted thereto, to the heel seat of the shoeby the use of headed nails 44.

The machine comprises a jack or support 46 (FIGS. 1, 2, 3 and 21) uponwhich the shoe 34 on the last 36 is mounted an active nailing die orsupport 48 which is mounted on a turret or carrier 49, a carriage 50(FIG. 5) for positioning and holding the leather heel 30 and its toplift32 over the active nailing die, or a modified carriage 50a (FIG. 7) forpositioning and holding the rubber heel 40 and the associated base lift42, over said die, upper and lower driver heads 54, 54a (FIGS. 3, 11, 12and 21) to which are secured primary and secondary nail drivers 56, 56a,fluid pressure means 58 (FIG. 21) for causing the heel seat of the shoe34, which is positioned on the jack 46 by .a back gage 68, to bedepressed against the leather heel 30 in the carriage 500r against thebase lift 42, which is spotted to the rubber heel 40 and may be regardedas part of the rubber heel, in the carriage 50a, and fluid pressuremeans 62 (FIG. 21) for raising the drivers.56, 56a to cause the nails 38in passages 64, 64a (FIGS. 3, 5 and 12) of the nailing die 48 to bedriven into the heel, or for raising the drivers 56 to cause the nails44 then in the passages 64 of the nailing die 48 of a type used inoperating upon rubber work to be driven into the rubber heel 40 and itsbase lift 42, and into the heel seat of the shoe 34, the pointed ends ofthe nails being clenched against a heel plate 66 of the last 36. Therubber heel 40 and its base lift 42 will be hereinafter referred to as acomposite rubber heel 40.

In the attachment of the leather heel 30 to the shoe '34, the nails 38are left projecting beyond a toplift receiving face 68 (FIG. 26) of theheel. As will be hereinafter explained, the toplift 32, during asucceeding stage of the cycle of the machine/is attached to the heel 30by spanking it onto the heel by the application of downward pressure ofthe heel, which then forms part of the shoe 34, against the topliftmounted in the carriage 50a and supported by the active nailing die 48.The carriage 50 is swung over a flat upper face 70 of the turret 49 anda flat upper face 70a (FIGS. 5 and 12) of the nailing die 48 and,preparatory to carrying out the heel attaching and toplift spanking onoperations, is arranged to dwell over said die in active positions inwhich the heel 30 and the toplift 32 positioned and held in the carriage50 are positioned respectively over the active nailing die.

The jack 46 is journaled upon a bearing pin 72 (FIGS. 1, 2 and 21)carried by a guide bar 74 which is mounted for movement along a verticalguideway 76 formed in a main frame 78 of the machine. Adjustably mountedupon the lower end of the jack 46 is a spindle plate 80 (FIG. 21)provided with a last pin 82 adapted to be interengaged by a thimble 84of the last 36 upon which the shoe 34 is mounted. The shoe 34 on thelast 36 is manually presented, bottom down and rear end away from theoperator, to the jack 46 with the thimble 84 of the last ininterengagement with the last pin 82 of the jack, said jack havingoperatively connected to it by a chain 86 (FIGS. 1 and 2) a slidablemount 88 for the back gage 60, the shoe being swung rearward togetherwith the jack until the rear end of a rand crease 90 (FIGS. 26 and 27)of the shoe engages a lower edge of said gage which serves to positionthe shoe lengthwise in the machine. The mount 88 of the back gage 60 maybe initially adjusted heightwise, widthwise and forwardly and rearwardlyof the machine by mechanism well known in the art.

In order to assist the operator in the positioning of a heightwisemedian plane of the heel seat of the shoe on the jack 46 in a verticalmedian plane 92 (FIG. 12) of the active nailing die 48 at a heelattaching station 93 (FIGS. 1, 3, 5 and 12) there is provided a breastgag e 94 (FIGS. 1, 18, 19 and 20) a face 96 of one of a pair of T-shapedplates 97 of which is adapted to be engaged by the edge of an outsole 98(FIG. 20) of the shoe 34 at its break line.

As will be hereinafter described, at the end of the heel attachingoperation the active nailing die 48 mounted in the turret 49 is swungbeneath a stepped lower plate 100 (FIGS. 3, 4 and 25) of an active tubeholder 102 of a battery of tube holders to receive the nails 38 or 44delivered from a nail distributor 104 generally similar to the naildistributor disclosed in United States Letters Patent No. 1,005,303,granted October 10, 1911, on an application filed in the name of JosephH. Pope and improved as disclosed in United States Letters Patent No.2,319,797, granted May 25, 1943, on an application filed in the name ofWallace M. Cutler.

The main frame 78 of the machine, which, as above explained, is similarin many respects to the machine disclosed in Patent No. 2,746,046,comprises a table portion 78a (FIGS. 1, 2 and 3), which houses most ofthe fluid pressure operated means of the machine, and an upstandingportion 78b upon which the jack 46 and operating mechanism therefor aremounted and to which the nail distributor 104 and nail transfermechanism are secured.

Secured by screws 106 (FIGS. 2, 3, 4 and 6) to the upstanding portion78b of the main frame 78 of the machine is an upper bearing housing 108having mounted in it an upper roller bearing 110 (FIG. 4) and secured byscrews 112 to the table portion 78a of the main frame is a lower bearinghousing 114 having mounted in it a lower roller bearing 116. Secured toa vertical shaft 118 are upper and lower bearing sleeves 120, 122 havingangularly disposed faces respectively adapted to engage the rollerbearings 110 and 116, the construction and arrangement being such thatthe shaft is journaled for rotation about a fixed vertical axis 124 andis confined against axial displacement. Threaded onto the upper andlower portions of the shaft 118 and in en forced engagement with theupper bearing sleeves 120,

122 are nuts 115, 119 respectively. The vertical shaft 118 has securedto it by screws 126 a collar 128 having adjustably secured to it a stopscrew 130 the purpose of which will be explained later.

Keyed to the vertical shaft 118 and resting on the lower bearing sleeve122 is a coupling 132 (FIGS. 4 and 8) having tongues 132a (only oneshown) which interfit with grooves formed in a bearing sleeve 134. Thebearing sleeve 134 has formed integrally therewith a radially projectinglug 117 (FIGS. 4, 8, 9 and into which are threaded stop screws 136, 136awhich, when the shaft is rotated counterclockwise and clockwise, asviewed from above, about the axis 124, are adapted to engagerespectively stop screws 138, 138a adjustably secured to bosses 140,148a on the lower bearing housing 114. The bearing sleeve 134 has formedon it a pair of spaced bosses 142 provided with bores in which a bearingpin 144 is secured, and journaled on said pin is a latch 146 which isnormally urged counterclockwise, as viewed in FIG. 4, by a spring 148(FIGS. 9 and 10). As will appear later, when the stop screw 136:: is inengagement with the stop screw 138a the active nailing die 48 is at theheel attaching station 93 and accordingly the machine is ready to startthrough its cycle. In order to insure that the machine shall not beoperated when the active nailing die 48 is not at the heel attachingstation 93 the lug 117 has adjustably secured to it a striker 121 (FIGS.4, 8, 9 and 24) which, when the turret has been moved to its restposition, depresses a plunger 123 of a switch M1 which is carried by theboss 140a of the lower bearing housing 114 across terminals of thisswitch. When the turret 48 is swung out of the above position to receivea load of nails the striker 121 moves out of engagement with the plunger123 and the switch is opened by spring action, thus cutting off thepower for operating the machine, as will be explained later.

The bearing sleeve 134 has an upstanding portion 134a (FIGS. 8 and 10)an inner cylindrical face of which engages the shaft 118 and mounted ona wear plate 125 carried by the bearing sleeve is the turret 49 whichhas a depending apron 49a slidingly engaging the outer cylindricalperiphery of the upstanding portion of the bearing sleeve. Adjustablysecured to the depending apron 49a of the turret 49 arecircumferentially spaced lugs 152 each having a notch 154 any one ofwhich, upon rotating the turret, may be moved selectively into aposition for receiving an arm of the latch 146. With the aboveconstruction it will be clear that the turret 49 may be released fromthe shaft 118 by withdrawing the latch 146 from the notch 154 of one ofthe lugs 152 and may be secured to the shaft by engaging the latch 146in any one of the four notches which may be considered as being formedin the turret.

The turret 49 is preferably made of aluminum and has formed in it fourrecesses 156 (FIGS. 8 and 12) each having parallel notches 158respectively formed in its opposite sides. The recesses 156 are adaptedto receive interchangeably one of a plurality of nailing dies 48 havingpassages 64, 64a of different nailing patterns, the inner ends of eachof the nailing dies engaging a stop screw 168 (FIG. 8) threaded into theinner wall of the recess and the outer wall of the nailing die beingsubstantially flush with the periphery of the turret 49. Each of thenailing dies 48 is efiectively held in its operating position in theassociated recess 156 of the turret by a latch bar 162 (FIGS. 2, 3, 4and 8) which is journaled on a screw 164 secured to the turret and has ahook portion attached to another screw 166 threaded into the turret. Ascrew 168 threaded into the latch may be used to force the nailing die48 against the stop screw 160 in the end wall of the recess.

During the heel attaching operation substantial pressure is appliedagainst the active nailing die 48 of the turret 49 and in order toinsure against any deflection of the turret at this time the peripheryof the turret has 8 secured to it four circumferentially spaced thrustplates 170 (FIGS. 2 and 3) which, when the turret is in its heelattaching position, engage respectively upstanding platforms 172 securedto the table portion 78a of the main frame.

Secured to and depending from the turret 49 at opposite sides of therecesses 156 respectively are guide rods 174 on which is slidinglymounted a yoke 176, said yoke by reason of its weight normally restingupon clamp collars 178 (FIGS. 3, 4 and 12) secured to the rods.Slidingly mounted in bores 180 at the lower ends of the guide rods 174are spring-pressed pins 182 the lower ends of which bear on lateralflanges 176a of the yoke 176 and which normally serve to maintain theassociated yoke in its lowered rest position against the clamp collars178 The yoke 176 has formed in it a pair of channels 184 for receivingthe upper driver head 54 having secured to it the drivers 56 upper endsof which extend into the passages 64 of the nailing die 48. The yoke 176has also formed in it a vertical bore 188 in which is mounted forvertical sliding movement a plunger 190 to the upper end of which issecured a driver head carrier 192 lateral sides of said carrier being inengagement with the inner side walls 194 of the yoke. The carrier 192has formed in it a cavity 196 for receiving the lower driver head 54a towhich the drivers 56a are secured. The plunger 190 is provided with acircumferential groove 195 (FIG. 11) for receiving a ball check 197 whenthe plunger 190 has been depressed to a predetermined position. Thisinsures against the plunger 190 contacting any other parts of themachine during the indexing of the turret 49.

The nailing die 48, the upper and lower driving heads 54, 54a, and thedrivers 56, 56a are assembled as a unit in the recess 156 of the turret49, in the channel 184 of the yoke 176, and in the cavity 196 of thecarrier 192, the assembly being secured in an operating position in theturret by the use of the latch bar 162.

As above explained, any one of the nailing dies 48 of the turret 49together with its associated nail driving mechanism above described maybe secured to the shaft 118 in an active position when the machine is inits rest position, by manually moving the latch 146 to a position inwhich it is withdrawn from the notch 154 formed in one of the lugs 152of the turret and rotating the turret on the shaft until the selectednailing die and its associated driving mechanism are arranged at theheel attaching station 93 and beneath the jack 46.

Secured to the lower end of the shaft 118 is a crank 299 (FIGS. 4 and21) pivotally connected to a rod portion 202 of a piston 204 slidinglymounted in a cylinder 206 which is pivotally mounted at 211 on the mainframe 78 and has faces 208, 210 open to lines 212, 214 leading to avalve 216 hereinafter described. As above explained, rotation of theshaft 118 and accordingly the turret 49 secured to it, incounterclockwise and clockwise directions, as viewed from above, islimited by the engagement of the screws 136, 136a carried by theradially projecting lug 117 of the bearing sleeve 134 with screws 138,138a carried by the bosses 140, 140a of the lower bearing housing 114,the stopping positions of the turret in opposite directions being variedby initially adjusting the screws 138, 138a in said bosses.

Rotatably mounted upon the shaft 118 between the turret 49 and thecollar 128 is a sleeve 218 having a lower flange 218a which fitsslidingly in a circular rabbet 220 formed in the upper face of theturret, said sleeve, as will be explained later, having attached to itthe carriage 50 or 50a in accordance with whether leather heels 30 andtheir toplifts 32 or composite rubber heels 40 are being attached to theshoe. In operating upon leather work the carriage 58, during the firstpart or stage of the cycle of the machine in which the heel 30 isattached by nails 38 to the shoe 34, is in its full line position shownin FIG. 5 with the leather heel 30 resting beneath the jack 46, andduring the last part or stage of said cycle when the toplift 32 isspanked onto the heel, the carriage is in its dash-line position beneaththe jack.

The carriage 50 comprises a base plate 222 (FIGS. 3 and 5 provided witha slot 224 in which fits a lug 226 secured to the lower flange 2180 ofthe sleeve 218, said base plate being secured to the flange of thecollar by a pair of screws 22% which pass through openings in the baseplate and are threaded into said base flange. The carriage 50 may bedescribed as comprising a heel receiving unit 236 and a topliftreceiving unit 232, rear ends of the heel 30 and the toplift 32positioned in the carriage being in engagement with rear gages 234, 234awhich may be initially adjusted into different positions forward andrearward of the carriage to accommodate heels of different sizes. Theheel 3t and the toplift 32 are held against the rear gages 234, 234arespectively by L-shaped breast gages 236, 236a which are slidablymounted in guideways 238, 238a. The operator moves the breast gages 236,236a forward by forcing the breasts of the heel 30 and the toplift 32against said breast gages in order to allow the heel and the toplift tobe placed in the carriage 50 and releases them, springs 240, 240aforcing the breast gages rearward until the heel and the toplift havebeen forced respectively against the rear gages 234, 234a. The sleeve218 has secured to it by screws 24-2 (FIGS. 3, 5. and 6) an arm 244having a rectilinear guide channel 246 for receiving 21 depending flangeof an abutment block 248, said block being adjustably secured to the armby a pair of screws 250 which are threaded into the arm and pass throughslots in the block. The abutment block 248 may be adjusted to differentoperating positions lengthwise of the channel 246, after loosening thescrews 250, by the use of a thumb screw 252 which is rotatably mountedin a notch of the block and is threaded into the arm.

When the carriage 50 is in its heel attaching position beneath the jack46 and a heightwise longitudinal median plane of the heel 30 iscoincident with the plane 92 (FIG. 12) through the nailing die 48, theblock 248 is in engagement with a pin or detent 254 which is constantlyurged to a lowered position by a spring 256 the arm 244 and to a screw260 threaded into the main frame until a stop screw 262 threaded intothe arm engages a stop screw 264 threaded into an extension of thebearing housing Hi8. Just before the arm 244 reaches the limit of itsclockwise movement (FIG. 5) a screw 266 secured to the arm engages therear wall of a slot 268 of a link 2276 pivoted to a plunger of a fluidpressure check valve 272. As the arm 244 is swung clockw se (FIG. 5) astriker screw 274 adjustably secured to a plate 276 secured to the armenga es a plunger 27% of a switchM9 (FIGS. 1 and 4) causing, throughmeans hereinafter described, a solenoid S8 (FIG. 21) of a valve 280 tobe energized to cause the desired amount of augmented pressure, which iscontrolled by a relief valve 282 and is additional to the initial orprimary pressure,

to be applied downwardly to the jack 45 so that nails 38 projecting fromthe heel 30 may be quickly and effectively spanked onto the toplift 32supported on the carriage 50 when a treadle 284 (FIGS. 1 and 23) of the'machine is depressed during the last stage of the cycle of the machineto effect the spanking on of the toplift. The carriage 51 is returnedfrom its spanking on position to its position shown in FIG. 5 inresponse to "swinging or indexing of the turret 49 to a position inwhich the active nailing die 48 receives nails from passages 306 in thelower plate 108 of the active tube holder .102 at a nail receivingstation. The active tubeholder may be defined as a nail deliveringmember or a fixed nail loader. I

The collar 128, as above explained, has adjustably secured to it thescrew 130 and the sleeve 218 has secured to and extending rearwardlyfrom it a block 286. When the carriage 50 is in its spanking dash-lineposition (FIG. 5) the block 286 of the sleeve 218 is in close proximityto the screw 130 of the collar 128, clockwise movement of the carriage50, as viewed from above, at this time being limited by the engagementof the stop screw 262 mounted on the am 244 with the stop screw 264 onthe bearing housing 108. When the drive shaft 118 has been rotatedcounterclockwise (FIG. 5) sufiiciently to move the turret 49 so that itsactive nailing die 48 is positioned beneath the lower plate of theactive tube holder 102, the screw operating through the block 2.36 hasrotated the carriage 50 sufficiently to move the bLlOCk 248 of the am244 forward of the pin 254. As will be explained later, the solenoid S5is de-energized while the active nailing die 48 of the turret 49 isbeing moved toward the tube holder 102, the pin 254 operativelyconnected to said solenoid being depressed by the spring 256 against'theupper face of the abutment block 248 and being moved by said spring toits lowered position shown in FIG. 6 after the block has run off the pin254. It will thus be clear that the carriage 50 is held in its heelattaching. position shown in FIG. 5 by the pin 254 when the turret 49 isindexed back to its rest position in which the active nailing die 48 isarrangedbeneath the jack 46 and until such time as it is desired to movethe carriage to its dash-line position preparatory to spanking" on thetoplift 32.

Nail transfer The upper bearing housing 108 has a bore 288 (FIG. 25) forreceiving a bearing screw 290 having a shoulder which is normally heldin forced engagement with said bearing housing by a nut 292, 'asupporting platform 294 having an upstanding sleeve portion beingjournaled on the bearing screw between the bearing housing and a head296 of said screw. Mounted on the bearing screw 290 in a predeterminedposition is a foot plate 298 provided with passages 300 of a pluralityof patterns. Slidingly mounted in a boss of the foot plate 298 is aplunger 302, said plunger being constantly urged downward by a spring303 and extending beyond the under face of said foot plate. The nut 292is used to clamp the bearing screw 290 and the foot plate 298 in theiroperating positions to the bearing housing 108. The supporting platform294 has formed in it four circular openings 304 for receivingrespectively the lower plates 109 of the tube holders 102, said lowerplates having the above-mentioned passages 306 of the same patternsrespectively as those of the passages 64, 64a of the nailing dies 48 ofthe turret. Each of the tube holders 102 comprises an upper plate 308which is provided with passages 310 of the same pattern as the passages306 of the foot plate 298, and a plurality of tubes 312 which extendinto and connect passages of the upper and lower plates of said tubeholders.

In order to position the tube holders 102. upon the supporting platform294 said platform has secured to it studs 314 which registerrespectively in notches 316 formed in the lower plates 100 of the tubeholders 102. The upper plate 308 of'ea'ch of the tube holders 102 isprovided with abore 318, the tube holder corresponding to the activenailing die 48 being positioned in its active position beneath the footplate 298 by swinging, after raising the plunger 302, the platform 294to move the proper tube holder to its active position beneath the footplate, said plunger then being released to permit the plunger, actedupon by the spring 303, to engage in the bore 318 of the upper plate ofthe tube holder and thus to hold the active tube holder and accordinglythe platform 294 against movement.

